1491191423999 has 8 divisors (see below), whose sum is σ = 1542630180000. Its totient is φ = 1439753892192.

The previous prime is 1491191423987. The next prime is 1491191424071. The reversal of 1491191423999 is 9993241911941.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1491191423999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491191423699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2659277 + ... + 3170825.

It is an arithmetic number, because the mean of its divisors is an integer number (192828772500).

Almost surely, 2^{1491191423999} is an apocalyptic number.

1491191423999 is a deficient number, since it is larger than the sum of its proper divisors (51438756001).

1491191423999 is a wasteful number, since it uses less digits than its factorization.

1491191423999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612097.

The product of its digits is 5668704, while the sum is 62.

The spelling of 1491191423999 in words is "one trillion, four hundred ninety-one billion, one hundred ninety-one million, four hundred twenty-three thousand, nine hundred ninety-nine".